Moscow - Russia - May 7, 2017 - Russian army S-400 Triumph medium-range and long-range surface-to-air missile system rehearse before the World War II anniversary in Moscow. REUTERS/Maxim Shemetov/

Advertisement

MOSCOW (Reuters)

Russia will supply Turkey with four batteries of S-400 surface-to-air missiles for $2.5 billion (1.86 billion pounds) under a deal that is almost complete, Sergei Chemezov, head of Russian state conglomerate Rostec, told the Kommersant daily on Wednesday

The deal has caused concern in the West because Turkey is a member of NATO but the Russian missile system cannot be integrated into NATO’s military architecture.

In addition, relations between Moscow and the Western military alliance are strained, in part because of Russia’s annexation of Ukraine’s Crimea peninsula.